When I go to the custom equalizer settings and when I shift one of the settings up or down the volume is lowered. This is the same for each band. When all the bands are in 0 position the volume is the same as normal. I tested also the presettings and I must say that it is very disappointing what I hear. The normal equalizer position is the best option and it has more or less always lousness active when I look at the spectrum volume display. The bands themself are not very helpfull to adjust the music genre.
I hope Sansa will facelift this function. I have an Zen Nano 512 MB that does it better, even the amplifiers produces a more warm sound than the Sansa in neutral settings.